[Healeys] Petrol Pump

[Bob Haskell]

Bob,

I got the following from Dave DuBois a couple of years ago:

"A few of us smart alec electronic types figured that the ultimate fix 
was to put a transistor in the circuit to control the high current of 
the coil when triggered by an extremely low current trigger circuit for 
the transistor.  This worked wonderfully for awhile.  To our chagrin, 
the pumps stopped working after a short period of time, due to the 
contacts of the points filming over.  Come to find out (which any good 
metallurgist) knows, the tungsten alloy contacts develop a film on their 
surface, that has to be removed, either by abrasion or (wait for it) the 
electrical arc produced when the points open - we had outsmarted our 
selves."

Cheers,

Bob Haskell
AHCA 3000 Mk I registrar
http://www.ciahc.org/registry_3000mk1.php

On 05/13/2014 11:55 AM, Bob Spidell wrote:
> Long as we're on the subject: I've always thought points (pump and ignition) were made of--or at least faced with--tungsten. Anyone know otherwise for a fact?
>
> Bob